Oil-pump.



No.,693, 7Z7. Patented Feb. l8, I902.

. w. A. MAYBACH.

OIL PUMP.

(Application med Mar. 28, 1901.1

(No Model.)

o. a Nor-ms nzrzns an. Puo'xou'rum. WASMINOTOII UNITED STATES PATENT OFICE.

WILHELM A. MAYBAOH, or CANNSTADT, GERMANY, ASSIGNOR TO DAIMLERMANUFACTURING COMPANY, on NEW YonK, NI Y., A CORPORATION or NEIV YORK.

OIL-PUMP SPECIFICATION forming part of Letters Patent No. 693,727, datedFebruary 18, 1902.

Application filed March 28; 1901.' Serial No. 53,345. (No model.)

To all whom it may concern:

Be it known that LWVILHELM AUGUST MA BAOH, a subject of the Emperor ofGermany,-

and a resident'of Cannstadt, in the Kingdo'm 5 of Wiirtemberg, Germany,have invented certain Improvements in Oil-Pumps, of which the followingis aispecification. -My invention relates to certain improvements inpumps, and more particularly to an improved form of oil-pump constructedto be used to force a lubricant to various parts of a machine requiringthe same. l

The object of my invention is to provide a pump for forcing liquid in anintermittent I stream to any desired points, which shall be simple inconstruction'and which shall have aminimum number of moving parts, afurther object of my invention being to provide means for accurately andeasily regulating the quantity of liquid discharged by the pump.

In the accompanying drawings, Figure l is a sectional view of, areservoir, showing my invention in its preferred form when used as 2 5an oil-pump. Fig. 2 is an inverted sectional view on the line 2 2, Fig.1.

It will be understood that while I describe and illustrate my inventionas applied to an oil-pump I may with equal advantage and withoutdeparting from the said invention employ it for forcing a liquid througha system of pipes for any desired purpose.

In the drawings,-A is a container or reser voir for oil, through whichruns a shaft b, the

same passing, if desired, through stuffing-j boxes in the sides of saidcontainer. On this shaft is keyed a worm b, meshing with a worm-wheel a,which'is mounted on a bear-j ing a, formed in the present instanceintegral 40 with and proj ecting inwardly from the bottom hub ofthe saidworm-wheelf The crank O also has a pin projecting from the side oppositeto that on which is the pin 0 and eccen'trically placed with relation tothe latter. A piston or plunger D has at one end a slotted'portion d,from which projects a guidingrod d, the said slotted part d having itssides 53 constructed to form guides on which slides a block 6. The pin cof the crank 0 passes through this block, which is reciprocated on theguides as the crank is. revolved. The guiding-section d of the plungeris supported in a bearing-plug F, screwed in the present instance intothe side of the reservoir and having its outer end formed to receive awrench. There is a space within this plug beyond the end of the rod d,and there are passages f f leading to this, freely connecting it withthe reservoir, whereby the liquid in said space is permitted to flow inand out as the said rod is reciprocated. Between the bearing-plug F andthe part d of the plunger is placed a spring f, supported on theguiding-rod 01, themessure exerted by saidspring upon the plunger beingadjustable by means of the bearing F. The opposite end of the plunger orpiston proper operates in and is supported by a cylinder g, formed inthe casting G, supported in the reservoir A in any suitable manner.Communicating with this cylinder g is a pas sage 9, having in it avalve-seat and opening into the interior of the reservoir through portsor passages 9 A valve H is constructed to fit the above-mentioned seat,and it extends through the bottom of the reservoir, being threaded andprovided with a head by which it may be manipulated from the outside ofthe reservoir. Also communicating with the cylinder g is a passage 9having a valve-seat and valve g and opening into a chamber I, in whichthere are openings 1' i.

To the upper part of the casting G is at- 0 tached a cup, the sides ofwhich are preferably of glass, the bottom thereof being formed so as tomake the chamber I when fitted to the projecting part of the castingG.In an opening at the top of this chamber I is fitted a glass pipe ornozzle i at'the upper'end of which is a small orifice i The top andbottom parts of the oil-cup J are tightly held to the glass part jthereofby any of the well-known means common to the 10p Oil or otherliquid to be pumped is placed in the reservoir A, and the cup J isalmost entirely filled with water, the same being retained therein bythe valve 9 which effectually prevents its escape into the reservoir.-

On turning the shaft 1) the worm b thereon causes the worm-wheel a torevolve on its bearin g a, and the pin a which projects from the upperface of the hub of said worm-wheel, engages the projection c of thecrank C. At the beginning of the suction-stroke of the pump this pin ais in a position one hundred and eighty degrees distant from that shownin Fig. 2, and the continued revolution of the shaft 1) causes arelatively slow movement of said pin and of the crank O, which is madeto turn in a direction indicated by the arrow in Fig. 2. During thissuction-stroke oil is slowly drawn into the cylinder 9 through theopening 9 and passage g, the cross-sectional area of the opening intothe latter being regulated by the valve H. When the pin a has reachedthe position indicated in Fig. 1, the movement of the plunger hascompressed the spring f. As soon, therefore, as the pin a has caused theprojection c of the crank to pass over a dead-point situated in the longaxis of the plunger D this spring causes the said plunger to movesuddenly forward, the crank being moved one hundred and eighty degreesalmost instantly, since the block e slides in the guides of the part Dand transmits motion of the plunger to it. As the worm-wheel continuesto revolve, the pin a comes up to and engages the projection c andcommences another stroke. It will be seen that during the suction-strokeof the pump oil is drawn into the cylinder 9 during a comparatively longperiod of time, and during the expelling stroke of the pump the plungerendeavors to force this oil out of the cylinder in a very much shortertime. The passage 9 is so proportioned as to make this impossible, andthe valve 9 is lifted and part of the oil escapes into the chamber I.Some of the water in this chamber is displaced thereby and flows out ofthe opening it to the interior of the cup J and the oil enters the tubet escaping from the orifice i thereof in globules or jets easily visiblethrough the glass sides of the cup. As the pump continues to operate oilcollects in the upper part of the cup atj and finally filling the sameflows out under pressure to the hearings or other mechanism to belubricated. It will be seen that the amount of oil forced from thecylinder g into the chamber I at each stroke may be varied by the valveH, since the amount of oil flowing back into the reservoir through thepassage g depends upon the area of the opening at the valve end of,

the passage g. For example, if the valve H is opened sufficiently togive a cross-sectional area into the passage 9 equal to that of thepassage 9 approximately half of the oil would be forced into the chamberI and the rest flow back into the reservoir. The amount discharged alsodepends upon the amount of the compression of the springf, and this maybe varied at will by screwing the bearing-plug F in or out.

I claim as my invention 1. The combination in a pump, of a cylinder, apiston, means for operating the pump, a rotatable piece connectedthereto, a reciprocating piece engaged by said rotatable piece andengaging the piston whereby itis caused to accomplish its forward orpressure stroke in a relatively shorter time than that required for itssuction-stroke, an inlet and an outlet passage to the cylinder, and anautomatic valve in the outlet-passage, the inlet-passage being smallerin section than the outlet-passage and thereby allowing the pump tooperate without an automatic valve in the same, substantially asdescribed.

2. The combination in a pump, of a cylinder, a piston, means foroperating the pump, a rotatable piece connected there to, areciprocating piece engaged by said rotatable piece and engaging thepiston whereby it is caused to make its pressure-stroke in relativelyless time than that required by its suction-stroke, an inlet and anoutlet passage to the cylinder and an automatic valve in theoutlet-passage, the inlet-passage being provided with means for varyingthe quantity of fluid discharged on said pressure-stroke and beingsmaller in section than the outlet-passage thereby allowing the pump tooperate without an automatic valve in said inlet-passage, substantiallyas described.

'3. In a pump the combination of a cylinder, a piston, admission andoutlet passages to said cylinder, said admission-passage at all timesfreely communicating with the fluid-containing portion of the cylinder,means for varying the cross-sectional area of the admission passage,continuously-rotatin g driving mechanism, a reciprocating piececonnected to the piston and mechanism connecting said piece with thedriving mechanism whereby the piston is caused to accomplish its travelin one direction in a relatively different time from that required forits travel in the opposite direction, substantially as described.

4., The combination of a cylinder, a piston operating therein, a crankconnected to said piston, mechanism independent of the crank butconstructed to periodically engage the same for turning it, and a springarranged to be compressed during the suction-stroke of the piston and tomove the piston on its pressure stroke independently of the turningmechanism, substantially as described.

5. The combination of acylinder, a plunger having a rearwardly-extendedportion,a guide for the same, and a spring on said extended portion, anenlarged section on the rear of the plunger, having in it a slot, ablock therein, a crank having a pin constructed to engage'the block,with detachable means for turning the crank, the said spring beingcompressed by said turning means during a part of the revolution thereofand expanding to move the plunger independently of the turning meansduring the remainder of the revolution of said means, substantially asdescribed.

6. In a pump the combination ofacylinder, a plunger therein, mechanismturning at a uniform rate for operating the pump, a crank movablyattached to the plunger and detachably connected to the said operatingmeans, the plunger being moved by the operating mechanism during itssuction-stroke, and having means wherebyit is moved independently ofsaid mechanism during its dischargestroke, substantially as described.

7. The combination in a pump for moving a fluid of a cylinder, a piston,an outlet-passage leading from the cylinder, a check-valve therein, apassage for the admission of fluid to the cylinder, said passage beingat all times open to the same and of a cross-section relatively lessthan that of the outlet passage, mechanism for reciprocating the piston,and a continuously-rotating device detached from the piston butconstructed to periodically engage the same, with a device constructedto cause said piston to accomplish its pressurestroke in a less'timethan that occupied by its suction-stroke substantially as described.

8. The combination of a cylinder, an inlet and an outlet thereto, aplunger having a slotted and a guiding section, a block constructed tobe reciprocated in the slotted section, a crank for moving said block, adriving-Wheel for the pump and a connection between said wheel and thecrank, aspring on the guidingsection of the plunger, the same acting toseparate the connection between the wheel and the crank once in everyrevolution thereof and piping connected to the cylinder forconductingthe fluid pumped tothe desired points, substantially asdescribed.

In testimony whereof I have signed my name to this specification inthepresence of two subscribing witnesses.

WILHELM A. MAYBACH.

WVitnesses:

WM. HAHN, H. E. REICHARDS.

